source: trip-planner-front/node_modules/csso/lib/index.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 3.4 KB
Line 
1var csstree = require('css-tree');
2var parse = csstree.parse;
3var compress = require('./compress');
4var generate = csstree.generate;
5
6function debugOutput(name, options, startTime, data) {
7 if (options.debug) {
8 console.error('## ' + name + ' done in %d ms\n', Date.now() - startTime);
9 }
10
11 return data;
12}
13
14function createDefaultLogger(level) {
15 var lastDebug;
16
17 return function logger(title, ast) {
18 var line = title;
19
20 if (ast) {
21 line = '[' + ((Date.now() - lastDebug) / 1000).toFixed(3) + 's] ' + line;
22 }
23
24 if (level > 1 && ast) {
25 var css = generate(ast);
26
27 // when level 2, limit css to 256 symbols
28 if (level === 2 && css.length > 256) {
29 css = css.substr(0, 256) + '...';
30 }
31
32 line += '\n ' + css + '\n';
33 }
34
35 console.error(line);
36 lastDebug = Date.now();
37 };
38}
39
40function copy(obj) {
41 var result = {};
42
43 for (var key in obj) {
44 result[key] = obj[key];
45 }
46
47 return result;
48}
49
50function buildCompressOptions(options) {
51 options = copy(options);
52
53 if (typeof options.logger !== 'function' && options.debug) {
54 options.logger = createDefaultLogger(options.debug);
55 }
56
57 return options;
58}
59
60function runHandler(ast, options, handlers) {
61 if (!Array.isArray(handlers)) {
62 handlers = [handlers];
63 }
64
65 handlers.forEach(function(fn) {
66 fn(ast, options);
67 });
68}
69
70function minify(context, source, options) {
71 options = options || {};
72
73 var filename = options.filename || '<unknown>';
74 var result;
75
76 // parse
77 var ast = debugOutput('parsing', options, Date.now(),
78 parse(source, {
79 context: context,
80 filename: filename,
81 positions: Boolean(options.sourceMap)
82 })
83 );
84
85 // before compress handlers
86 if (options.beforeCompress) {
87 debugOutput('beforeCompress', options, Date.now(),
88 runHandler(ast, options, options.beforeCompress)
89 );
90 }
91
92 // compress
93 var compressResult = debugOutput('compress', options, Date.now(),
94 compress(ast, buildCompressOptions(options))
95 );
96
97 // after compress handlers
98 if (options.afterCompress) {
99 debugOutput('afterCompress', options, Date.now(),
100 runHandler(compressResult, options, options.afterCompress)
101 );
102 }
103
104 // generate
105 if (options.sourceMap) {
106 result = debugOutput('generate(sourceMap: true)', options, Date.now(), (function() {
107 var tmp = generate(compressResult.ast, { sourceMap: true });
108 tmp.map._file = filename; // since other tools can relay on file in source map transform chain
109 tmp.map.setSourceContent(filename, source);
110 return tmp;
111 }()));
112 } else {
113 result = debugOutput('generate', options, Date.now(), {
114 css: generate(compressResult.ast),
115 map: null
116 });
117 }
118
119 return result;
120}
121
122function minifyStylesheet(source, options) {
123 return minify('stylesheet', source, options);
124}
125
126function minifyBlock(source, options) {
127 return minify('declarationList', source, options);
128}
129
130module.exports = {
131 version: require('../package.json').version,
132
133 // main methods
134 minify: minifyStylesheet,
135 minifyBlock: minifyBlock,
136
137 // css syntax parser/walkers/generator/etc
138 syntax: Object.assign({
139 compress: compress
140 }, csstree)
141};
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